Hydraulic press.



N0 MODEL.

W/ TNESSES.

PATENTED MAY 24, 1904. P. W. FULLER.

HYDRAULIC PRESS.

APPLICATION nun 0OT.15, 1903.

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UNITED STATES Patented May 24, 1904.

PATENT -OFFICE.

HYDRAULIC PRESS.

SPECIFICATION forming part of Letters Patent No. 760,978, dated May 24, 1904.

Y Application filed October 15, 1903. Serial No. 177,145. (No model.) 7

To all whom it may concern.-

Be it known that I, PERoY VVHEATON FUL- LER, a citizen of the United States, and a resident of Dorchester, in the county of 'Suflolk and State of Massachusetts, have invented a new and Improved Hydraulic Press, of which the following is a full, clear, and exact description.

This invention relates to improvements in hydraulic presses or similarly-actuated devices, an object being to provide a press of very simple construction in which two different liquids are employed in connection with an equal arm-lever, whereby a press-of great efficiency is provided.

I will describe a hydraulic press embodying my invention and then point out the novel features in the appended claims.

Reference is to be had to the accompanying drawing, forming apart of this specification, in which the figure is an elevation, partly in section, of a hydraulic press embodying my invention.

Referring to the drawing, 1 designates the press-cylinder in which the ram 2 operates.

Extended downward from the cylinder 1 is a" pipe 3, and this pipe 3 is placed in communication with a water-supply tank 4 through the medium of a pipe 5. Arranged in this pipe 5 is an upwardly-opening valve 6, and an upwardly-opening valve 7 is arranged in the pipe 3 above its connection with the pipe 5.

Arranged at one side of the cylinder is a force-pump, comprising a cylinder 8, in which a column of mercury 9 is placed. Operating in the upper end of the cylinder 8 or onthe upper end of the mercury column is a piston 10, having its stem 11 connected to an operating-lever 12, fulcrumed at its end to a stud 13 on the upper end of the cylinder 1. At the lower end the mercury column presses on a piston 14, the stem 15 of which is pivoted to one end of a lever 16, fulcrumed at its center on a standard 17, and upon the other end of this lever 16 a stem 18 is pivoted and is connected to apiston 19, operating in the lower portion of the pipe 3. The lever 16 being pivoted at its center, the opposite extensions thereof are of equal lengths, and it will be noted that the three stems 11, 15, and 18 are of equal lengths.

Extended upward from the lever 16 is a rod 20, the upper end of said rod being connected to the lever 12, as here shown, by means of a pin on said lever passing into a slot in the upper end of the rod. By this arrangement there is a slight lost motion between the lever and the rod when the lever is started in its'downward course.

The mercury column is of such a height that its weight is approximately equal to the pressure of one atmosphere, and therefore by means of this column of mercury the required pressure on the lever 12 is materially reduced as compared with the presses as ordinarily constructed.

The operation is substantially the same as in other pressesthat is, by moving the lever 12 downward pressure is brought to bear upon the mercury, which forces the piston 14 downward and the piston 19upward, opening the valve 7, so that water will pass into the cylinder 1. Upon the upward stroke of the le- 'ver the rod 20 will carry the outer end of the lever 16 upward, consequently forcing the column of mercury upward. It will be noted that the pressure of the rod 20 on the lever 16 is counterbalanced by a weight 20 on the lever.

Having thus described my invention, 1 claim as new and desire to secure by Letters Patent 1. In connection with a hydraulic press, a force-pump comprising a cylinder, and mercury therein, the weight of the mercury approximating one atmosphere.

2. In a hydraulic press, a jack-cylinder, a

pipe extended downward therefrom, a valve in said pipe, a pipe connection between said first-named pipe and a water-supply, a valve in said connection, a force-pump arranged at one side of the cylinder and comprising a cylinder, a column of mercury in said pump-cylinder, a piston operating in the lower end of thepump-cylinder, an equal arm-lever arranged below the cylinder, a connection between said piston and one end of said lever, a piston operating in the pipe extended downward from the jack-cylinder, a piston arranged in the upper portion of the pump-cylinder, and a lever for operating saidpiston, the stems of the several pistons being of equal lengths.

3. A hydraulic press comprising a jackscylinder, a pipe extended downward therefrom, a valve in said pipe, a valved water-supply pipe, a force-pump arranged at one side of the cylinder and comprising a pump-cylinder, mercury contained therein, a piston operating in the lower portion of the pump-cylinder, a piston operating in said pipe leading downward from the jack-cylinder, a centrally-fulcrumed lever having connection with said pistons, an operating-lever, a piston attached to said operating-lever and working in the upper portion of the pump-cylinder, and a rod connection between the first-named lever and said operating-lever.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

PERCY WHEATON FULLER.

Witnesses:

GEO. A. NEAL, A. C. WHITE, Jr. 

